Report Builder - Trying to find data in a second Dataset based off of two items in the current dataset

Question

The situation:
I have two datasets for collecting meter reads. One is for the last Raw read, the other is for the last Billed read. Each table has the reads for machines based on the serial number and meter type. For example:
Raw - 
SN: ABC123456
Read Date: 8/1/14
Black Impressions: 237
Color Impressions: 136
I need to generate a report that has both sets of reads, preferably under the same Meter Type
Black Impressions
Serial Number
Read Date
Raw Read
Bill Date
Bill Read
I was thinking I could use a Code function to return the Billable Date and Read. But to do so I would have to pass three different items over to the code and I am not sure how to do so. As you will see in a second, I know very little about VB coding, but
here is along the lines of what I was thinking. 
Function BillableMeterRead(ByVal metername As Decimal(0), billablemetername as Object(0), billableread As Object(0)) as Decimal
ct=0
fct=0
For Each item As Object In billablemetername
ct+=1
If metername=billablemetername Then fct=ct
Next
ct=0
For Each item As Object in billableread
If ct=fct Then return something
ct+=1
Next
End Function
So am I close at all?

Answer 1

Lookup only works in a one to one relationship. That's not what I am trying to do here. Printers have more than one type of page count. There are Black Impressions, Color Impressions, and Page Count (for example). So I want to have a report that shows the
Billable Pages for an asset (from one dataset) and then the last Raw pages for the same asset (from the second dataset). 
For example I would want one of the lines to be...
Serial Number, Last Billed Black Impressions Read Date, Last Billed Black Impressions, Last Raw Black Impressions Read Date, Last Raw Black Impressions, Last Billed Color Impressions Read Date, Last Billed Color Impressions, Last Raw Color Impressions Read
Date, Last Raw Color Impressions, Last Billed Page Count Read Date, Last Billed Page Count, Last Raw Page Count Read Date, Last Raw Page Count.
So if I used Lookup like you suggest, it would only return the Black Impressions, since that's the first read typically stored for the device. How do I then get the Color Impressions and the Page Count? I can use LookupSet, but then how do I break the data
out? How do I lay that data onto the table?